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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac872fe6686c0a5d37b6acb09a09ff6399dd528cd425444bbc128d9d839493d' 
  AND token = 'yDcrdZ8r3qcijzSXRK0fpNzksoN9cwbmwBFCL5oaVQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}