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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0758e26844914d3d087c2ab0d82356fb501bc0022375920be52ba56e66317929' 
  AND token = 'cQdpCO7AYVf5ypBC2qD+Rw195RU9ySB3md8kiwO1qgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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