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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7da01700af29a70bc6bad7c744f44d95f37ba9c78412a403c95571241251dc6' 
  AND token = 'UlyB1eTqSdUrnX1TqJ+JIPmhkkwDT+s/AW5wwNYFqtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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