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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58219baedaf5784e342bad52f07fbf02763231d3c43b854bf6bf002e3887306a' 
  AND token = '3b15xqlTpDV7kERdw6RQtIxERFz4g+nnDQs9MjAxzuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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