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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d75f290af33f5923fa62fe34c88e55ff630a04074d0a50012eaba3676c7239c' 
  AND token = 'eg3639yPsPyAO8oWN56IaGVHI4zvvJgrWAaOi++Dv4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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