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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768490d52b4dd44ada2af70a94ca08333f3f1fcdbdd79421ce69ae78ab0e7866' 
  AND token = 'B1Ij6piypKyWWwDNqRYsHT9kRrZCjKoM1pWvAMWkKKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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