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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc40701f58e32ffbbb6bf6109cf3717ef9a17b9d099c77947b9d6292a62da9ed' 
  AND token = 'SlPoUi6y9BXbTu/JLLEXpJoOflNpg8KA8KK9ZTShc4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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