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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19559167fb2d9d5d069e1cd3f4e03a743652007a13e31bef5eaaa1e47cd78db8' 
  AND token = 'mnhWaRzrteb2srlIVlHYGk20291j87q3LRF76R4IqrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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