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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4394b91ea2fe1eb2817a9118173121789fc4cfd5ebff224f93d3574a2a93ccb6' 
  AND token = 'Z0IgxUk+DJwdblP+Xx21twQpkERz6P4g1Y0ps+Q404o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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