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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dacfb6a9e688e8569f0e6e3884cd8fc767e117f929bda38e7aaa72db19a9551' 
  AND token = 'vedXnad8Vh8pqzaGeLzAOpMQ98UFjhvam3HehFlSpvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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