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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56c7f91b83afd92d16847f6a054e046565d96c19a513f3ca0f0a5ae9fdc46bb' 
  AND token = 'UM8+kfAaZyXv7XT0vHo0bazBY5HBgl37mV7phtmz1nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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