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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f556e31aa0f2e820ff913730d0fbf1f77ff012f16ac10341d7ceb1958777bfd' 
  AND token = '6qke7zdxhCo+4KiKFfhRsc4WaDOllD8JpgnZTkv9bBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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