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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be5f6372976c7f07d1016ddf0a2e025efc8e7db3e451210c94cd31ea6423eef' 
  AND token = 'Tj95MFx6rMh/BOX/gD6nNyjm40SeVvP+r8HaLSKgtMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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