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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68f3829028b9be133abbd74d83b3a0c0efa34c97790aedae438d3796bb2fb22' 
  AND token = 'ghWJuDiBNib0yMW1lLDWg3kKqODqSX0+E94ES8yI1pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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