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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e517fa8fa1326648600202918665c16ced16407fc5c07a026e3018df3f760cd8' 
  AND token = 'nXxf/4JQg53Tefxn54G+rsoGesVBz8IR+BBX1RlSqMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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