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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e4b2be2fe15983ebb5ee40d647460e2ddad0efacbce75ae9f8600dbf0e3033' 
  AND token = 'zUYJ5b5Y3of8svcLF60j54NwbEev+7OSNNLgVA+zbf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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