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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3cfb07916c0a70f75c719a1c0b1faef06940dd3604836fc1db6fbbf5b16ef39' 
  AND token = 'fOq6kLFiSvYCL6giJGBiDauPfi7/1VMc39vQz+y4dj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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