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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45f83e3e510404c385a87663477c33bc2ce4ee9bb4cd0392f56818a773d71ca' 
  AND token = 'V+s4lzjRgY0ehW9kLapz3ICPlsr0bEnVhuZQzdoF89I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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