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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e8f661cb6994183f6f15974cd3f85ac1756a3fa37c8df51db2af1b2f8c1e69' 
  AND token = 'HSTlCE71Jwhyd4OU06xl2qiLX67aKRV1YvujW9fVqKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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