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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f9f9978a70c6646fcbc0e7954c8adb6562d7f0c5cc6c2076c3df0bc480d18e' 
  AND token = 'qYRjpbdlr/YywQVpseWAlg5xjj6I+T+epi6IgvlvLC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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