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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67bcfc84bdb2cdec7aa775b47811682365f8d4125b8590361bf31767780c0318' 
  AND token = 'WhtjsdW2oOfraTEVbF/LozDcwDqkcexY4wmlw+or3cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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