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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54ef1832b2f678cfade231a4134dc0d385db2c69b8f826ad257f4d297c96a23' 
  AND token = 'cTW6rxQ5W/vC4c74/SZm190wutOkjHiPjMBxNbO+U/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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