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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e84e7139281c5f175b7d477079c6f2226dac5e862b70c6e21d3f07cad0f14ca' 
  AND token = '46uMzdWun00Tgo7blwdDb/wZhiZ37iCI4TWMnK6HsU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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