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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a577c0a07609b2c13f76be7cf64deee04b0343b2179af5c6bd4542cebc67d92' 
  AND token = 'sSlj2yfyXl+vMQVjmkWWPJQvecDEFGZF35i67X8kHsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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