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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988f28b4722a8584c268da329e895d4bfbf4efc22d102cf6e72b26feeca636b6' 
  AND token = '3IR4dyPhjID7d7DRkxj37g5+F0Mt0nNfHYl+AF4NSUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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