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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a89a0a7218bca7dde5878d054389a524b454f16b257f73dc94224969b48fc0' 
  AND token = 'UN1dVO9f6U33/IuR/cqOioFdw4+2sYqSF0VHSWstkQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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