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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47216a2e1b91e37b508b6f4af1efb416ab7125844c53ba2acda64804240bd6d2' 
  AND token = 'Cx4OJc88NzJT+qhQZJwLv42KXWJB41hYQAxfW6ks8dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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