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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db7fcd23c1878ecc69a6d8a8e434d5cd6fc834fc9e7531390ae822607fb0d13' 
  AND token = 'tVC6K9ke76f4/qqWmLPLMM0vPVYNfEXda0zesiewaP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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