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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d614993e4bbb0f29d52ab9ddb9b03f010dec79a756c7d635f8d345921e87965' 
  AND token = '1wKG0bOrmv9AUvQ7lVCeFQspKG/n2b9EzHl70HcLZqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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