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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47355be12352b0baa3fcc7e18d3413746b6dcaab480e32e98bcf509f8d1febbf' 
  AND token = 'pvlbgeecynKpFVtGiudTmuhEtf5NgiXN0acE8WL8yWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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