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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f2b1c27d7d7742beb7776dd3f16598e2465e4b32c9fb68b491f322dd159171' 
  AND token = 'c906CTpqw6hvqaw4vYbaJSu5dWYIF/qV9l0cFFooSJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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