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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a6975e65e0d85d5d682ed747e32ddc526de8a5ba599fc224170b38cc67e980' 
  AND token = '0UQOgonebC/1qprmlnnG2DAK7GvJ5Elgl/6FELHtYvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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