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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790bf3bec714ef605ddba2e6fea4e5c57058f3ba95c905725388dd2c7e7792c0' 
  AND token = 'LXiNCrGWDlXTLQAu3hB3SZfW8hyWdC5WtpOP0U4BPV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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