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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1e7e956829d8558da71bc3ce82ebcde7439785a59d1ec76441707724a2ccdd' 
  AND token = 'UDB2Ml+MxqRGcSbt2Tr+IO7av5bEfZCYQ8OIO3v/Ad4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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