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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401172cdbc8e199d5fe1c0271f441ea2734db56729fdfc64495ca9d0580a8432' 
  AND token = 'NDAX5RCNg96QaKUQ88fIjV02oT1gmcx0QyAYXcG+Nmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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