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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598ba94fb49411f3f1d54ba895302cc1b281ff566bfdb67f600caa2e4e72c157' 
  AND token = 'j7AJL1ZNx26ABy/T1G60RZEHxf9SwP55YXTtqeDWqh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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