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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe54056fc3c8bb3b2d863d0d03f3b22fbd721e9e927ca5050206acd09d52a9f5' 
  AND token = 'RjSyPIO/yEYa0wmGjd24wz2XomVwz6KSFCCnWbnMDqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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