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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd331531aa694e4d513eb05d82b5edf614c50c774fc2608fd1b00a377c8fea2fc' 
  AND token = 'cDFLvgOXwzyBm6KsaUKb7RERFgrAo1c7HLUEn3zpKHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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