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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfb7bd697ca0f530dae4ca93d12e5c94782b0c9b8f99e99aedd1fc751eb6bdd' 
  AND token = 'DtFZpo7Y2d/RdVYDnKuJHKltCwNuLo3IWj//NWaJ9xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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