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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b47e6d7d1d6a5380002fbedbf110962af2105752d298007214f90d2b53eacf' 
  AND token = 'NihKaEbkrLDYsj2V3u49j5PmsJY5Pb4+6ydi5stzq0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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