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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1970acafe7a0eeb7477aef744eddc379e96e43f97b97546b37db215a3e8ae0a6' 
  AND token = 'sGccoG2tH3jYzCqHb+E38r6Vo6rbWzGiRTa7RHXXpSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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