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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f6880ab127231df9985832ea0ce70e1195817189370c7ffa7e53bdb3d495d1' 
  AND token = 'aQGhjSoFPriGntgW4QOOg6z1actWlB73CwEdIMSWTu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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