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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147db86fc0b09fcbea6451679484407a46de80f2569fba51546d04f8ed06ffd3' 
  AND token = 'Eh+/e7+ILjncSeF+5XkWRsfZs9zRjW3yrh5N9pQe6Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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