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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62699d89f11f2487978c70c6b9ac9203d21b420a2768159c1d097bc85b08d985' 
  AND token = 'vOGnEDAG5cLr+OYtINUXhTOzRkchSFXI5EJhUafRPsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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