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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c696fbd2414fdb5b8b2ef1d397af944e58410abb0be311b96eae2f7f184d0e1' 
  AND token = 'XULUoNx+ZITEJFqf0nJxwGerwL+DS6tmTX5bJNWm060=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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