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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ad273a0f982e84741e9d54ddc2431b3e99352341b6f6d2c678338ad1a26cee' 
  AND token = '4gFRWpR80bALGT7Stumuq0DVgK/mT9tQJh/cEU7Tsm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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