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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02175b0bb22baf4700a74256531570c71abd8b6d36dac650e9f5df33bacc354' 
  AND token = '+gzhlx220veXJEPUvHqADXFtxTEjf7Ap0O4BsIpDDks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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