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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230a0bc4ab56d52a3cbd8b0a3f7ef54bd3b401fc8a2d0a891edec5b666ff65ea' 
  AND token = 'l2ejUN1KDa8ZhYFzsqcnNo+Iab2f2CZkjOnGjbf4Qxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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