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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0852513663a14f6dde6818ffc42b18ab284d0e61a4e835a714560a0997336152' 
  AND token = 'lCCbF59LxItEkryR6IwaeIa0YYqrQmT85PsMfR4ANHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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