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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1854b246b53328fc1b6c41b7102f0470038dba70b8b6a3aef87cce5844923420' 
  AND token = 'byz5GO5/nGeH+A8T+Uo6lxVBDYnOUrH6frjRXHgMJcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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