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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772d7d3988019985c08c590d28cbd6f556db3f3b88dd59256d10223261b73d23' 
  AND token = '28to2KkOBV/8JDUDWB2xkakUHlxeFZ7PfpaIwwgMz9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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