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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19aaefd91b5cb5646f7e8c60d6846672bc6e2fbd6303c243623bdba49825d266' 
  AND token = 'ThyU6l1TIj0DGKXs6sksqgZsE7N7B6fEehAPsvfinGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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