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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc9822b6a1e1ea35bae649546469c0ce0f393aa2506e64e29594fccd0bcc38c' 
  AND token = '1i05p0+bIfwSi13WXa5fAyyA19MX+oeO4f3ZUq/mnHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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