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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7b26047d2556d52abc2861d4f07a7e09be5abe46fe7dff2e8a7a2b4879c6f8' 
  AND token = 'tEhtaOQi7qfzN7sWSUb8mOEDucvLSpLWfENIyGC5Nuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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