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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8314f36d25f4c32d0f877294d76d7d3e17267acbf7e8117f76b6d329eaca40' 
  AND token = 'dqpkcx+km6frf6xUNVi5ODHWdU0+/6AF6Y1YpYFweok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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