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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9261ea0f91f70a404449d2c03b27191427f288647788b8ed06655685968f1006' 
  AND token = 'rZpQ8ifAw/UIGhzBICHQM84rx2N0CrJEu9xD4kHaM6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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