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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87219b02144ac3fde433f34330604ce336372253effd4b82846c2c7dadaa5de9' 
  AND token = 'iuCn4HVvdl3VsiIJJNSc6+1CEKVSNN0OBuuEFe4HPCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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