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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460be1befcaf4bfa149d33be5ea5315f98b4f9cd8dcfc19ab12bb8e2ce931ed7' 
  AND token = 'DCDAUaqjA80LPhWV+P6K6yq6xU/nO5cMMvAqoHJJlW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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