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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2630d3dbaa4e472ea0e44a8ee5eb5475f75ac4b51a32a089717be433b1a6cb1' 
  AND token = '+M7dBOXGF9ZZmiQs3SLAmLxP/drEQMFurfmilCzn83w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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