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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b56e1f4217b386ff476a5b208a333f014a3fd3569deed6dd4b8b9500166e12' 
  AND token = 'EdkmCz/wXqRoNgAFE9hSB5RaWuiMtgCA/m3O5F2OOXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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