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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad80005174b5f64ec92bd16916dc67075e2a8851db2a6684733661e3f8b325e' 
  AND token = '2bLf2x+nJv4N3fEEhmJBqMWBi0bU0sT+qbe/PXoW1ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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