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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5947734dd9f9d95832503f104d83539067c7e6cfeca7ee46c1adbd72c3fd57a5' 
  AND token = '/68hgaM48i3TFjDqf2c9vHqnPEG6Oy6CKvwxlDca4MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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