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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66fd2903200f58bf219d385ad6204a8a782702b1e8818134e871b0d5a01c48ee' 
  AND token = 'MzNfQOt2Dq4aip2o8rBLTTroWf46a1iLJ101p5qg5jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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