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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86079b317ae096820ae7b861696efd6118ef37bc45831cb04daf8781c3ef0ce8' 
  AND token = 'TxoPD/RRFQzXTjyWEhC5TF9LwpSgmgcdwhb7cbUQj0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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