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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6495fed21cc345eb7b5d2ac0d47d4de0e6f2e5bbae21a644afb3b08648c421' 
  AND token = 'N4VM9SekjEwY0kIaEXPVLqVVR9nG4J9MVctfdDQFLQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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