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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19ef5681a2ebc9e712cf247efcb75535833813689f42cbf5640877a2514c2c2' 
  AND token = 'F17MFkiPpyIi5Nc15Hobzj5lauzMNep/BoKjDvcpqwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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