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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a1bf2bc86ebd6d91b5f4237f71d77ae31a729d7a61acd1c0161b1db3ac2dd5' 
  AND token = 'HPp8sYMOnYV+UMccVkEjU2gC3Zk3veYrFs4NqRtwkG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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