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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '348832a31b531959afbc725d02ddeada7f299ae48894c9fd9f4db2748468cc4d' 
  AND token = 'AHijAUJxEYFOpM6xKO8uXwPke7eRCHcUjukrhEGmJ4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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