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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33e3c0c011dc94cc2e265732ce7756350278b82cc780289d14634f1b47445e3' 
  AND token = 'tGUcXOyqgKrOe8nVVw8N85WYU7+B4Xk8wJRQKjzOaPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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