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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef324b27b733ae3f6d4c04d9c6f5140423d5a9b647f64714ec1b58a042e4cb97' 
  AND token = 'maG5gE0XAj0XEpvZLLr4O3VnqVtCjgj8ul4XhbENUOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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