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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316b811c053b67de654f97c38887fe96ba64f6f38a7161f797535a816dd2bc34' 
  AND token = '3UoHgwiZ4dW0cneMQDzFVBs78HAA2eu1Gd7ula5r698=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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