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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92ad8474655fcbd2b0fdf9693b75640584c632faa9d8d8ee41b6d80368978e3' 
  AND token = 'O5Vt6qMe904XIzgVIpJL0u3Fuy7TusLLuCO4QdWqI6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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