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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cce640db35668480bd3dc6ddfacc159f7ead994ed4f75eafb99046362565943' 
  AND token = '1pLcywa2rHuECOEeszq9wcjo9k6odZMnil4aDI+dQg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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