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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83078cbf98f90ca4dcbf9baa7936aad1b5a748730b600b0dce0762c8e5a0860c' 
  AND token = '3yAZ0TwOUQjs1Y6BWYCkpPgukO5aZzbefEBuk2pRDwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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