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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192d962c783e86e952fc381176ade5b350ef26e1884fbd1641cadf5697d83d28' 
  AND token = 'wVsWkmqgpYIg2DQzO4e7kD8yeq4kft+rU1Z7LN1R4ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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